Data is specified per bar in the chart. You can specify data as an array of y values, or as an array of [label, value] pairs. Note that labels are used only on the first series. Labels on subsequent series are ignored:

You can add a secondary x axes, and the tick spacing of the axes can be separately controlled with the "tickMode" option. "bar" will produce tics at bar boundaries, "even" will produce evenly spaced ticks. If you set the axes max greater than the sum of the data range (the maximum x value), the plot will be padded. Note that you should set the max on both axes to the same value.

Legend labels can be specified independently of the series with the "labels" option on the legend. These will override any labels specified with the series. There are also options to control the number of rows and number of columns in the legend as well as placement.

Here the legend is positioned to the "north" and set to render 1 row tall (number of columns determined automatically). Note that an extra css specification was added to pad the bottom of the title of this chart to give room for the legend above the plot.